The name Roselynn is of English origin, derived from the combination of the words "rose" and "linn" (meaning "pool" or "lake"). It first emerged in the late 18th century as a feminine variation of the more common name Rosalind.

In its earliest form, the name was likely influenced by the romantic medieval tales featuring the character Rosalind, a beloved heroine from Shakespeare's play "As You Like It". The addition of "lynn" to the name may have been an attempt to create a more melodic and lyrical version of the name.

One of the earliest recorded uses of the name Roselynn dates back to 1792 when it appears in a parish record from the county of Somerset, England. However, it did not gain widespread popularity until the late 19th and early 20th centuries.

Throughout history, several notable individuals have borne the name Roselynn. One of the most famous was Roselynn Carter (née Smith, born 1927), the wife of former United States President Jimmy Carter. She served as the First Lady of the United States from 1977 to 1981 and was known for her advocacy work in support of mental health initiatives.

Another notable Roselynn was Roselynn Sizemore (1909-2005), an American country music singer and songwriter from Virginia. She is best known for her hit song "Lukka Coo Coo Paluka," which became a popular novelty song in the 1940s.

In the literary world, Roselynn Drexler (born 1926) is an American novelist and playwright. Her novel "I Am the Beautiful Stranger" (1965) was one of the first mainstream novels to explore the experiences of a transgender woman.

Roselynn Kachuk (born 1955) is a Canadian artist and sculptor, known for her large-scale public art installations featuring intricate metalwork designs inspired by nature.

Lastly, Roselynn Hoskins (1943-2003) was an American activist and community organizer from Chicago. She played a crucial role in the civil rights movement and worked tirelessly to promote social justice and equal rights for underrepresented communities.